如何检查特定的键数组元素是否存在？

Question

i have my view in twig

and i have an array which has or hasnt key value i need how to check it if its exist ?

example {{ weather.wind.deg }} and for current moment its possible there is no wind deg so the weather.wind array will not contain an element witch key deg how to check it if it has it or no ? maybe i should do it before i past this to my view ? somewhere here ?

$app->get('/', function () use ($app) {
    return $app['twig']->render('index.html.twig', array(
            'weather' => $app['weather_service']->get($app['location_service']->get()),
            'location' => $app['location_service']->get())
    );
});

Answer 1

In you twig template you can do :

{% if weather.wind.deg is defined %}
        make your things
{% endif %}